Lightweight Aggregates

Pumice Aggregate

Pumice Aggregate is a low density highly vesicular, volcanic glass consisting mainly of silica SiO2. The high silica content (70% per g/100g) positively affects the quality of pumice increasing the hardness of the material and its resistance to chemical attack.

Pumice Aggregate is highly recommended in lightweight concrete blocks either blended or as an all in pumice mix. In cast stone as a lightweight backing mix and chimney flue liners. Lightweight precast structures including panels, pods, fence posts, beams and staircases.

Expanded Clay Aggregate has been pelletised and fired in a rotary kiln at a very high temperature. As it is fired, the organic compounds in the clay burn off forcing the pellets to expand and become honeycombed while the outside surface of each granule melts and is sintered. The resulting ceramic pellets are lightweight, porous and have a high crushing resistance.

Expanded Clay is utilised in an ever-increasing number of applications. In the construction industry, it is used extensively in the production of lightweight concrete blocks as well as both a sound and thermal insulation material, and flue & chimney lining material. Also used as a structural backfill against foundations, retaining walls, bridge abutments etc.